大地电磁场偏移成像方法的改进与应用

本文在对电磁场成像技术进行系统研究和总结的基础上,分析综述了大地电磁场成像技术的研究现状与存在问题,进而提出了改进的有限差分法大地电磁场偏移成像技术,使差分方程精度和成像分辨率得到了提高,并对客观选取背景电导率、两种极化模式联合成像以及多参数和再次成像进行了创新研究,最后利用模型试验和实际大地电磁场资料的实例展示了该方法偏移成像的成果及其实用性.

Improvement and Application of the MT Migration Imaging Method*

This paper first summarized the achievements carried out by former researches and gave out their defects based on systematic study of EM imaging techniques. Then,put forward a new migration imaging technique of MT data using the improved finite difference method, which greatly increased the accuracy of the difference equation and the imaging resolution. Moreover, the paper also made further researches including the selecting of suitable resistivity background, joint imaging of two polarized modes, multi-parameters and second process imaging. Based on the calculation results of the model and the real observed MT data, the approach we provided has been testified as a more practical and effective measures for MT imaging.